aBo, check Your tap and You will see that design #3 will be hard to thread. #4 will be easier, since You can run the tap all through the block.
I´ll humbly leave the direct cie cooling discussion to the more experienced.
regards
Mikael S.
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The only constant factor in all Your failures is You.
Catapultam habeo. Nisi pecuniam omnen mihi habis, ad caput tuum saxum immane mittam.
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